Anti stripping high alumina bricks are referred to as anti-stripping bricks or anti-stripping refractory bricks. Anti-stripping high-alumina bricks are widely used in my country's new dry process kiln, Libore kiln and wet process kiln, including kiln door cover, rising flue, cooling zone, decomposition zone, safety belt, transition zone, coolant rear Walls and side walls and beams with curved ceilings.
Anti stripping high alumina bricks refractory bricks
Anti-stripping high alumina bricks use high alumina bauxite clinker as the main raw material, introduce a small amount of ZrO2 (due to the phase transition between monoclinic and tetragonal ZrO2, which can improve the thermal shock stability of refractory bricks), add a certain amount of compound Binder and additives, by controlling the particle gradation of mud, the refractory products obtained by molding and high-temperature firing become anti-stripping high-alumina bricks.
Item |
Index |
Al2O3%≥ |
70 |
ZrO2% |
6-10 |
Refractoriness℃ |
1790 |
Bulk densityg/cm3 |
2.5-2.6 |
Apparent porosity% |
20-23 |
Normal temperature compressive strength MPa |
55 |
0.2MPa Load softening start temperature |
1470 |
Thermal shock stability(1100cooling water),time |
35 |
Specifications of anti stripping high alumina bricks
The standard size of anti-stripping high alumina bricks is 230*114*65mm, and other sizes can be customized according to the drawings.
The performance principle of anti-peeling high alumina brick
The anti-peeling mechanism of high alumina bricks is due to the fact that after the introduction of ZrO2, its microstructural characteristics determine its anti-peeling properties.
(1) There are obvious micro-cracks around the ZrO2 aggregate, and the aggregate has obvious gap peeling with the surrounding corundum and mullite.
(2) The well-developed ZrO2 aggregates are columnar and form a layered distribution in space. There are small slits between ZrO2, the size of which is only 1-5 μm, forming a channel structure. This structure is superimposed with superimposed layers, tortuous and tortuous, which is conducive to stress transmission and dispersion.
(3) Mullite is well-developed and fibrous, interlaced with ZrO2 and corundum in space, forming a composite reinforced structure. Obviously, when ZrSiO4 decomposes at high temperature, it reacts with surrounding A12O3 to generate ZrO2 and mullite. The existence of ZrO2 crystals prevents the growth of fibrous mullite crystals and platy corundum, and is wrapped by them, so it is surrounded by ZrO2. Chaos state.
(4) The petrographic analysis shows that the structure of corundum and mullite is interlaced, ZrO2 is intercalated, and there are microcracks around, and the larger ZrO2 crystal itself and its surroundings have radial microcracks.
The use of anti-stripping high-alumina bricks
Anti-stripping high alumina bricks are referred to as anti-stripping bricks or anti-stripping refractory bricks. Anti-stripping high-alumina bricks are widely used in my country's new dry process kiln, Libore kiln and wet process kiln, including kiln door cover, rising flue, cooling zone, decomposition zone, safety belt, transition zone, coolant rear Walls and side walls and beams with curved ceilings.
Advantages and characteristics of Anti stripping high alumina bricks
(1) High refractory temperature.
(2) 0.2MPA load softening temperature is greater than 1500 degrees.
(3) Excellent thermal shock resistance, more than 25 times of water cooling at 1100 degrees.
(4) High compressive strength at room temperature, greater than 60MPA.
(5) The apparent porosity is low and the volume is stable at high temperature.
(6) Excellent anti-peeling performance.
(7) Good chemical resistance.
High alumina brick is one of the indispensable basic refractory materials in the upper and middle parts of blast furnace body in iron and steel industry
Common low-creep high-alumina bricks can be used in blast furnace hot blast stoves, as well as other industrial kilns, and can also be made into low-creep high-alumina bricks of different sizes according to specific construction requirements, such as lattice bricks, special-shaped bricks, anchor bricks, etc. , mainly used in industrial kilns in long-term high temperature environments
high alumina refractory bricks is mainly used around the furnace cover, electrode holes and exhaust holes of electric furnaces, and its service life is 1 to 2 times longer than that of silica bricks.
Insulating high alumina refractory bricks mainly refer to refractory products with an aluminum content of more than 48%. They are also called lightweight high-alumina bricks or heat-insulating high-alumina bricks due to their advantages of low bulk density, light weight, and good heat insulation effect. . It is a kind of thermal insulation refractory brick commonly used in high temperature industrial kilns and thermal equipment.
Magnesia alumina bricks use periclase as the main crystal phase and magnesia-alumina spinel as the matrix. They are better in thermal shock resistance than magnesia bricks. In order to improve the thermal shock resistance of magnesia bricks, alumina or alumina is introduced into the ingredients. Bauxite clinker fine powder to form a magnesia-alumina sharp stone matrix, thereby making magnesia-alumina bricks
Magnesia chrome bricks are refractory products with magnesia (MgO) and chromium trioxide (Cr2O3) as the main components, and periclase and spinel as the main mineral components. The main raw materials for the manufacture of magnesia-chrome bricks are sintered magnesia and chromite.
Yuying Refractory produces a complete set of refractories for electrolyzers, and the new impermeable bricks are used in conjunction with impermeable castables
The high-alumina bricks are mainly used in the regenerator of the hot blast stove. The lattice bricks with a certain structure are arranged in an orderly manner, and the upper and lower through holes of the lattice bricks can allow the gas to pass through.